Blow molded plastic structures are provided for use in various structures such as, but not limited to, tables, chairs, walls, backboards, storage bins, sports equipment and the like. Each metal sector includes an inner curved portion which forms an inner surface of the wall and is convex inward relative to the wall, an outer planar portion which forms an outer surface of the wall, and two side planar portions which connect the inner curved portion to the outer planar portion. The output signal level of the upstream amplifier is controllable. The base station device receives the information from the control device. The invention also includes semiconductor structures having two doped regions of a semiconductive material separated by a region less heavily doped than the doped regions.